With the aim of characterizing the atmospheric Na layer, the Teide Observatory facilities have been used in the last years to carry out a long term monitoring experiment on LGS generation by low power laser excitation. The LGSs are generated by a Rodamine 6G Dye tunable laser launched from the Optical Ground Station with a typical output power of 400 — 500 mW. The LGS images are obtained in a bistatic configuration with a baseline of 165 m. The experiment has been improved in several aspects in order to boost the Na photon flux return. The natrium-Teide experiment has generated a dataset of more than 400 images of Na LGS traces obtained in 37 nights. The main results are going to be been published soon.